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2010-03-23T18:31:59+01:00
(a²-2ab-1)+(a²-4ab+5)=?
a²-2ab-1+a²-4ab+5=?
2a²-6ab+4 = ?

a=¼
b=2

2a²-6ab+4 = ?
2*(¼)² -6*¼*2 +4 =
2*1/16 -6*½ +4=
⅛ -3 +4=
⅛ +1 =
1⅛
1 5 1
2010-03-23T18:35:26+01:00
(a²-2ab-1)+(a²-4ab+5) =
= a² - 2ab - 1 + a² - 4ab + 5 =
= -6ab + 4 =
= -6(¼ * 2) + 4 =
= -6 * ½ + 4 =
= 3 + 4 =
= 7

;))
2 3 2